Not all teen boys run. My OH was 16 when I told him, we'd been going out about 9mths when I accidently fell pregnant. I gave him the option to leave me. As it was my choice to have the baby, I didn't want to force him into anything he might not want to do. But he's still here, hes 20 now and we're expecting number 2.
Good luck hun, there is no easy time to tell family, but that's life. You just need to do it x